Thanks for the "fee" tip,. I have to look how to do that on Blockchain. As i've always seen it, it only has "my deposit address" and says "this is where people can send you money etc" I've never seen an option to check off a fee.

and so is an entire day normal for not receiving a 10BTC transaction into my blockchain wallet?

There do not appear to be any outstanding transactions for 10 BTC to that address. You'll need to check with the sending wallet. It appears that either the transaction was never relayed to the network (and the bitcoins are therefore still in the original wallet), or that the transaction failed to receive any confirmations for some reason and has expired (and the bitcoins are therefore still in the original wallet).

where 10 BTC were sent to 19NZqW3UU6SEL8bKkMLjf3pDmmvgLpDffg on 2013-03-23.

Since I don't know anything about the wallet that has address 1LTUD1mEkgPjj19g8TrhgfiicuDKt3mteG, I'm unable to tell you where these bitcoins went or why. If 1LTUD1mEkgPjj19g8TrhgfiicuDKt3mteG is part of a hosted wallet somewhere, it is possible that the bitcoins were simply transferred to cold storage while internally continuing to show you your original account balance.

There is no transaction currently visible on the bitcoin network at blockchain.info within the past 24 hours sending 10 BTC to that address. That transaction was either never relayed or has expired (or you accidentally entered the wrong address). You'll have to check the original wallet to determine what happened. If you can get a transactionID from the original wallet, I can assist you further.

- snip -There do not appear to be any outstanding transactions for 10 BTC to that address. You'll need to check with the sending wallet. It appears that either the transaction was never relayed to the network (and the bitcoins are therefore still in the original wallet), or that the transaction failed to receive any confirmations for some reason and has expired (and the bitcoins are therefore still in the original wallet).

Based on our conversation so far, I'm assuming that you are using https://blockchain.info/wallet for your wallet. Typically that wallet would inform you if there were something preventing it from relaying the transaction or if the transaction did not receive any confirmations after an extended time. Under either of those conditions, it would typically adjust the balance to reflect that the bitcoins were still in the wallet and had not been successfully sent.

If you are using https://blockchain.info/wallet, and you log in to the original wallet, and you still see the balance -10 BTC, and the wallet still has the transactionID of the transaction, then please share the transactionID here so we can look it up at: